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J. T. HOGAN. ORE GRINDING DISK. APPLICATION FILED AUG.31. 1920.

I Patented Nov. 7, 1922.

1,4L35J 3G.

IN VEN TOR.

Patented I Nov. 7', 1922.

iii rats JOHN T. HOG-AN, OF DENVER, COLORADO.

ORE-GRINDING DISK.

Application filed August 31, 1920. SerialNo. 407,097.

To'allwhom it may concern.

Be it known that 1, JOHN T. HOGAN, a citizen of the United States. residing at Denver, in the county of Denver and State of Colorado (whose post-oflice address 389 S. Los Angeles Street, Los Angeles, California), have invented new and useful Ore-Grinding Disks, of which the following is a specification. ,v I,

My invention relates to an improvement in ore grinding disks, in which material is ground between the ridged and grooved faces of two disks, which may be horizontal or vertical, and of which usually only one revolves; and the object of my improvement is to take advantage of the centrifugal force which is inherent in the operation of this class of grinding machines to provide improved and effective means for advancing the material from the inlet to the point of discharge so as to insure a gradual and rapid grinding of the same.

I attain these results by the mechanism illustrated in the accompanying drawing, in which Fig. 1 is a vertical half section of the stationary disk; F ig. 2 .a vertical half sec tion of the revolving disk; Fig. 3 a view of the grinding face of the stationary disk; Fig. 4 a transverse section of one of the ridges on the line 4, 4, in Fig. 2, and Fig. 5, the grinding face of the revolving disk.

Similar letters refer to similar parts throughout the several views.

The orifice O, in Fig. 1 and Fig. 3, is the opening through which the material to be ground is introduced between the disks, the flat finishing surface adjacent to the circumference being indicated by The ridges are indicated by R and the grooves by G.

The revolving disk. which is shown in Figs. 2 and 5 differs from the stationary disk only in that there is no opening in the center thereof.

Both the ridges and grooves acquire de clivity as they leave the flat surface and ap proach the center. As can be seen in Fig. 4:, the ridges have a flat surface and a slope on one side so that material can get between them and are vertical on the other side so that the material reduced in size can drop into the following groove. The direction of rotation of the revolving disk is shown by the arrow in Fig. 5.

In operation the stationary disk is brought against the revolving disk and the material.

.put and consuming power.

to be ground is introduced through the open mg in the stationary disk. The large pieces of ore are broken at the center of the disks and are advanced by centrifugal force towards the circumference, being gradually reduced in size as the result of the decreas ing space between the disks. Heretofore only radial ridges and grooves .have been employed in ore grinding disks and as centrifugal force will not throw out material in a straight line such disks have the grooves and the entire space between the disks filled with material which is but slowly ground and discharged through the adjustable space between the flat surfaces adjacent to the circumference of the disks, thus limiting out- My improvement provides a movement of material between the disks as also a discharge, that is posterior to radial when the directions of the ridges and grooves are arranged with regard to the direction of rotation of the revolving disk.

The disks are adapted to be attached to machines now in common use, and it is not deemed necessary to show or describe such machines in this specification and drawing.

I claim:

1. ()re grinding disks having a flat finishs5 ing surface adjacent to the circumference, and nonradial ridges and grooves extending from a central eye or space to the flat surface, the ridges and grooves acquiring height and width as they approach the flat surface, the tops of the ridges and the bottoms of the grooves having plane surfaces.

2. A stationary grinding disk having a flat finishing surface adjacent to the circumference, with nonradial ridges and grooves extending from a central eye or space to the flat surface, the ridges and grooves acquiring height and width as they approach the flat surface, the direction of the ridges 110 and grooves being arranged with regard to the direction of rotation of an opposite revolving disk, and an opening in thecenter of the disk for the admission of material to be ground, the tops of the ridges and the bottoms of the grooves having plane surfaces.

QIlIlCllIlg disk havlng a flat 8. A revolving 0 finishing surface adjacent to the circumference, with nonradial ridges and grooves extending from a central eye or space to the flat surface, the ridges and grooves acquiring height and Width as they approach the flat surface, the direction of the ridges and grooves belng arranged with regard to the direction of rotation, the tops of the ridges An ore grinding disk having a central space, a finishing space at the circumference of the disk said finishing space having a plane surface, non-radial alternate ridges and grooves between said finishing space and said central space, said ridges and grooves having plane surfaces and bases respectively, said ridges and grooves having their surfaces and bases respectively, in planes de clining from the plane of said finishing space to said central space and inclined relative to one another. and sloping Walls between the bases of said grooves and the surfaces of said ridges at one side of the latter.

. p JOHN T. HOGAN. lVitnesses CHESTER B. SMITH,

HAL IE E.-Esrns. 

